| Aqueous solutions of potassium carbonate, with and without an amine additive, were used as the acid gas removal solvent in the Coal Gasification/Gas Cleaning Test Facility at North Carolina State University. The acid gas removal system consisted of a packed absorption column, flash tanks, and a packed stripping column operated with a reboiler. Information on the removals of CO(,2), H(,2)S, COS, and other species from the crude coal gas was provided, as well as data on their distribution in regeneration exit streams. Operating conditions for the selective removal of sulfur species were also examined.;The agreement between program predictions and pilot plant data is quite good, supporting the assumptions of the model. Program simulations provide insights into the effects of changes in process variables on system operation.;To better understand the process and extend pilot plant results to industrial situations, a system model was developed and incorporated into a simulation program. The model was based on the mass transfer rate of a key component, CO(,2), with the assumption that non-key reactive components affect the equilibrium of the key component, but not its mass transfer rate. The absorption and stripping of non-key components were assumed controlled by equilibrium between the gas and liquid phases in these columns. An isothermal flash model for chemical solvents was also developed and included in the program. |
